If you have defined the foreign key constraints as on update cascade then the primary key value that was changed should cascade down to all the foreign keys with that constraint. if you do not have the on update cascade constraint, then you will need create scripts to complete the update.. On update cascade will update all referencing child records when the parent record is updated. 3) see the cascade actions in 1) and 2) above. on using parent record ids as foreign keys (in child tables) -- experience says a) if the ids are auto-generated sequence numbers, then do not use them as foreign keys. use some other unique parent key. Defining foreign keys. in the iso sql standard, foreign keys are defined through a foreign key constraint.the syntax to add such a constraint to an existing table is defined in sql:2003 as shown below. omitting the column list in the references clause implies that the foreign key shall reference the primary key of the referenced table..
There is not "on update cascade" automagically. there are ways to do it, o deferrable constraints. defer the foreign key check until commit, update the parent, update the child and then commit.. Foreign key constraints are an integral part of sql server database design. these are used to maintain integrity among related data in different tables. while implementing update and delete operations on values in the parent table (referenced table with primary key) we have to consider the impact on related values in the child table.. A foreign key constraint on a stored generated column cannot use on update cascade, on delete set null, on update set null, on delete set default, or on update set default. a foreign key constraint cannot reference a virtual generated column..
